Hardware description
45
Connections and use of the I/O in the supply unit
The table and the figure below describe the connections and use of the I/O in the
supply unit. The use of I/O is fixed in the supply unit control program and the wiring
to RMIO terminals are made accordingly at the factory. The settings of the supply
control program and the connections of the supply unit I/O must not be changed by
the user.
IO Name Use in the control program Connected device / Purpose
RDCU standard I/O channel
AI1 Not in use Not in use as default. Not in use as default.
A12 Not in use Not in use as default. Not in use as default.
AI3 Not in use Not in use as default. Not in use as default.
DI1 ALARM / FAULT Overtemperature supervision: 1->0: Alarm.
0: Fault (after preset time delay).
LCL filter temperature sensors (in series)
DI2 ON / OFF Supply module on/off control. 0->1: On.
0: Off.
Operating switch, control circuitry
DI3 ACK MAIN
CONTACTOR
Main breaker/contactor supervision. 1:
closed (enables supply unit start)
Contact in main breaker/contactor control
circuit
DI4 EARTH FAULT Ground fault supervision. Can be activated or
inactivated by parameter. 1: No fault. Not in
use as default.
Insulation monitoring device (option +Q954)
DI5 ALARM / FAULT Supervision of cooling unit. Can be activated
or inactivated by parameter. 1->0: Alarm.
0: Fault (after preset time delay). Not in use
as default.
Cooling unit monitoring circuit. Not in use but
hard-wired to +24 V DC of RDCU when no
optional cooling unit is in use.
DI6 RESET Supply module reset. 1: Reset. Not connected as default. Fault reset can be
given from control panel.
DIIL Not in use Not in use as default. Not in use as default.
RO1 CHARGING On/off control of charging contactor. 1: On. Charging circuit control relay
RO2 LCU ON / OFF Liquid cooling unit on/off control. 1: On. Cooling unit control relay. Not connected
when no optional cooling unit (+C139, +C140
or +C141) is in use.
RO3 MAIN
CONTACTOR
CONTROL
Main breaker/contactor control. 1: On. Breaker control circuit
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